jihoonson opened a new issue #6389: Replace MapBasedRow with ArrayBasedRow for groupBy URL: https://github.com/apache/incubator-druid/issues/6389 MapBasedRow is a row backed by a hash map which can incur substantial overheads while adding and getting items. This can become more significant as the result size grows. Since the column order in the result is decided and fixed when a query is submitted, we can use ArrayBasedRow instead which is backed by an array.
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